Create app.py

app.py

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+import gradio as gr  
+import PyPDF2  
+
+def extract_pdf_lines(pdf_file):  
+    # Extract all lines with page/line numbers for user reference  
+    with open(pdf_file.name, "rb") as f:  
+        reader = PyPDF2.PdfReader(f)  
+        result = []  
+        for i, page in enumerate(reader.pages):  
+            page_text = page.extract_text()  
+            if page_text:  
+                lines = page_text.splitlines()  
+                for ln, line in enumerate(lines):  
+                    # Prefix each with [Page X Line Y] for clarity  
+                    result.append(f"[Page {i+1} Line {ln+1}] {line}")  
+    return "\n".join(result) if result else "[NO TEXT FOUND]"  
+
+def show_sample_context(raw_text, example):  
+    """Show where sample value occurs for user feedback and future rule logic."""  
+    context_lines = []  
+    lines = raw_text.splitlines()  
+    example = example.strip()  
+    for i, line in enumerate(lines):  
+        if example and example in line:  
+            prev_line = lines[i-1] if i > 0 else ""  
+            next_line = lines[i+1] if i+1 < len(lines) else ""  
+            snippet = f"...\n{prev_line}\n>>> {line} <<<\n{next_line}\n..."  
+            context_lines.append(snippet)  
+    if not context_lines:  
+        return "No match for example in extracted text."  
+    return "\n---\n".join(context_lines)  
+
+with gr.Blocks() as demo:  
+    gr.Markdown("# PDF Field Teach-Me Extractor (Hugging Face Space Example)")  
+    pdf_in = gr.File(label="Upload PDF")  
+    raw_text = gr.Textbox(  
+        label="Raw extracted text (copy-paste any value for training)",   
+        lines=20,   
+        interactive=False,  
+        show_copy_button=True  
+    )  
+    pdf_in.change(extract_pdf_lines, inputs=pdf_in, outputs=raw_text)  
+
+    gr.Markdown("""  
+    ### 2️⃣ Teach the System  
+    - Copy a sample value you want to extract, and paste it below.  
+    - Assign a field name (will become a column header later).  
+    - Click "Show context" to see where this value appears (future step: use this to build automatic rules!).  
+    """)  
+    label = gr.Textbox(label="Field Name (e.g., 'Customer Name')", lines=1)  
+    example = gr.Textbox(label="Sample Value (copy from above)", lines=1)  
+    context_out = gr.Textbox(label="Value context in raw PDF text", lines=4)  
+    search_btn = gr.Button("Show context")  
+
+    search_btn.click(fn=show_sample_context, inputs=[raw_text, example], outputs=context_out)  
+
+demo.launch()